The primary reason for roof algae in Central Michigan is moisture. You’ll usually see these streaks on the north-facing side of the house or areas heavily shaded by trees. In Mt. Pleasant, Alma, Midland, and Clare, our humid summers provide the perfect “petri dish” for these spores to land and spread across your roofline.

As the algae grows, it creates a dark pigment to protect itself from UV rays, which is what causes the visible black staining on your home.

The biggest mistake people make with roof algae in Central Michigan is using a high-pressure washer. Shingles are covered in ceramic granules that protect the asphalt from the sun. Pressure washing blasts these granules off, effectively “aging” your roof by 10 years in a single afternoon.

Professional contractors use a “soft wash” method, applying a specialized cleaning solution that kills the algae at the root without the need for damaging pressure.

If you are planning a roof replacement, you can prevent roof algae in Central Michigan before it starts. Many modern architectural shingles are infused with copper or zinc granules. When it rains, these metals release ions that are toxic to algae, keeping your roof clean and streak-free for the life of the shingle.

This is a smart upgrade for homes in wooded or shaded areas where algae is a recurring problem.

Sometimes, simple maintenance can help manage roof algae in Central Michigan. Trimming back overhanging tree branches allows more sunlight to reach the roof and improves airflow. The faster your shingles dry after a rainstorm, the less likely algae is to take hold.

Keeping your roof clear of organic debris like wet leaves and pine needles also removes the “compost” that helps algae and moss thrive.

Are black streaks dragging down your curb appeal? Energy Plus Home Improvements can evaluate your roof and help you decide on the best path for cleaning or replacement.

Energy Plus Home Improvements
Phone: (833) 438-3744
Website: getephi.com
CTA: Schedule a roof inspection!